Replacing the Ur-Kilogram with High-Precision: The new system of units and the precise determination of the defining constants.

Attention:  The seminar will be held as "tele-seminar" using the Zoom conference tool. Registered participants will receive the Zoom link by eMail. If you are not registerd as participant you can find the connection details here. You need loging with your Uni-ID to access the page.

The seminar is intended for master students (MVSEM). Exceptionally interested bachelor students (>4th semester) could also participate. Please contact us beforehand.

Please follow this link for the registration.

Contents:

"Recent decisions of the General Conference on Weights and Measures of the Metre Convention have opened the door to a fundamental change of the International System of Units, the SI, in 2018. The revised SI will be based on fixing the numerical values of seven defining constants corresponding to the seven traditional base units. This will bring about basic modifications in the definition of the kilogram, the ampere, the kelvin, and the mole and will have consequences for units derived from them. In contrast, the second, the meter, and the candela will not be affected.

[...] Benefits and a wide-reaching impact for the realization and dissemination of the units are anticipated because innovative technologies with ever-increasing accuracy will emerge, enabling the direct realization over widespread measurement ranges without the definitions themselves having to be changed." 

[cited from: J. Stenger and J.H. Ullrich, Annu. Rev. Condens. Matter Phys. 2016.7:35-59. ]

The seminar will discuss the new definition of the SI units and the precise determination of the defining constants. The following topics will be discussed:

• Introduction to the revised SI system
• The Second and the hyperfine transition in Cs
• The Meter and speed of light
• The Mole and the Avogadro project
• The Kilogram and the Planck constant
• The Ampere and the elementary charge
• The Kelvin and the Boltzmann constant
• The Candela and the luminous efficacy of radiation

Comprehensive reviews of all seminar topics are available online in Annalen der Physik,Volume 531, Issue 5, Special Issue: The Revised SI: Fundmental Constants, Basic Physics and Units
and PTB Mitteilungen 2016 Heft 2

Lecturer:

Prof. P. Braun-Munzinger (PBM) , Prof. J. Stachel (JS), Prof. U.Uwer (UU)

Dates and venue:

The seminar takes place on Fridays, 11:15 - 13:00. depending on the number of participants the seminar will either take place as a Zoom conference or in person. Details will be announced in due time. 

The seminar will start on Friday, 06/11/2020 with the assignments of the topics.

Registration:

Please follow this link for the registration.

Übungsgruppen

• Gruppe 1 (Braun-Munzinger/StachelUwer/)
  7 Teilnehmer/innen
  TBA, Fr 11:15 - 13:00